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Related Experiment Videos

Glutamate and glycine decrease the affinity of [3H]MK-801 binding in the presence of Mg2+

G von Euler1, Y Liu

  • 1Department of Histology and Neurobiology, Karolinska Institutet, Stockholm, Sweden.

European Journal of Pharmacology
|May 15, 1993
PubMed
Summary

MK-801 binding to NMDA receptors is affected by glutamate and glycine. High concentrations of these neurotransmitters decrease MK-801 affinity, potentially impacting NMDA channel function and magnesium block.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • The N-methyl-D-aspartate (NMDA) receptor is a critical ion channel involved in synaptic plasticity and neuronal excitability.
  • Dysfunction of the NMDA receptor is implicated in neurological disorders like stroke and epilepsy.
  • MK-801 is a known ligand that binds to the open state of the NMDA receptor channel.

Purpose of the Study:

  • To investigate the binding characteristics of [3H]MK-801 to the NMDA receptor channel.
  • To examine the influence of glutamate and glycine on [3H]MK-801 binding at physiological magnesium concentrations.
  • To elucidate the mechanism underlying the observed modulatory effects.

Main Methods:

  • Utilized radioligand binding assays with [3H]MK-801.

Related Experiment Videos

  • Employed membrane preparations from rat cerebral cortex.
  • Assessed binding in the presence of varying concentrations of glutamate, glycine, and magnesium ions (Mg2+).

    • Main Results:

    • Glutamate and glycine exhibited biphasic effects on [3H]MK-801 binding, enhancing it at low concentrations and inhibiting it at high concentrations.
    • The inhibition of [3H]MK-801 binding by glutamate and glycine was associated with an increased dissociation rate.
    • These effects were reversed by competitive antagonists of glutamate and glycine.
    • Findings suggest a decrease in MK-801 binding affinity induced by glutamate and glycine in the presence of Mg2+.

    Conclusions:

    • Glutamate and glycine modulate [3H]MK-801 binding to the NMDA receptor in a concentration-dependent manner.
    • High concentrations of glutamate and glycine reduce MK-801 affinity, possibly by altering the binding site characteristics.
    • This modulation may reflect changes in the voltage-dependent magnesium block of the NMDA channel.